tan10°/(1-tan^2 10°)怎么算

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tan10°/(1-tan^210°)怎么算tan10°/(1-tan^210°)怎么算tan10°/(1-tan^210°)怎么算tan10°/(1-tan^210°)=1/2x2tan10°/(1

tan10°/(1-tan^2 10°)怎么算
tan10°/(1-tan^2 10°)怎么算

tan10°/(1-tan^2 10°)怎么算
tan10°/(1-tan^2 10°)
=1/2x2tan10°/(1-tan^2 10°)
=1/2tan20°